Mug



FIG. 1 is a front perspective view of the mug showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines depicting environmental structure are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a mug, as shown and described. 